<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">

  <title>烟花</title>


</head>

<body>


  <style>
    .headban {
      position: relative;
    }

    .headban canvas {
      position: absolute;
      left: 0;
      right: 0;
      top: 0;
      bottom: 0;
    }
  </style>
  <div class="headban" style="width:300px;height:300px;border:1px solid red;">
    <h3 id="canvas-container" style="width:300px;height:300px;border:1px solid red;"><canvas></canvas></h3>
    <!-- <img class="tuyear-banner" src="https://pqnoss.kepuchina.cn/2023/01/19/11/image/52437a.png" alt=""> -->
  </div>
  <!-- <div id="canvas-container" style="width:200px;height:200px;border:1px solid red;">
    123
  </div> -->
  <script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
  <script src="https://cdn.jsdelivr.net/npm/dat.gui@0.7.9/build/dat.gui.min.js"></script>


  <script>
    $(document).ready(function () {
      var Fireworks = function () {
        /*=============================================================================*/
        /* Utility
        /*=============================================================================*/
        var self = this;
        var rand = function (rMi, rMa) { return ~~((Math.random() * (rMa - rMi + 1)) + rMi); }
        window.requestAnimFrame = function () { return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (a) { window.setTimeout(a, 1E3 / 60) } }();

        /*=============================================================================*/
        /* Initialize
        /*=============================================================================*/
        self.init = function () {
          self.dt = 0;
          self.oldTime = Date.now();
          self.canvas = document.createElement('canvas');
          self.canvasContainer = $('#canvas-container');

          var canvasContainerDisabled = document.getElementById('canvas-container');
          self.canvas.onselectstart = function () {
            return false;
          };

          self.canvas.width = self.cw = $('.headban').width();
          self.canvas.height = self.ch = $('.headban').height();

          self.particles = [];
          self.partCount = 30;
          self.fireworks = [];
          self.mx = self.cw / 2;
          self.my = self.ch / 2;
          self.currentHue = 170;
          self.partSpeed = 5;
          self.partSpeedVariance = 10;
          self.partWind = 50;
          self.partFriction = 5;
          self.partGravity = 1;
          self.hueMin = 150;
          self.hueMax = 200;
          self.fworkSpeed = 2;
          self.fworkAccel = 4;
          self.hueVariance = 30;
          self.flickerDensity = 20;
          self.showShockwave = false;
          self.showTarget = true;
          self.clearAlpha = 25;

          self.canvasContainer.append(self.canvas);
          self.ctx = self.canvas.getContext('2d');
          self.ctx.lineCap = 'round';
          self.ctx.lineJoin = 'round';
          self.lineWidth = 1;
          self.bindEvents();
          self.canvasLoop();

          self.canvas.onselectstart = function () {
            return false;
          };


        };

        /*=============================================================================*/
        /* Particle Constructor
        /*=============================================================================*/
        var Particle = function (x, y, hue) {
          this.x = x;
          this.y = y;
          this.coordLast = [
            { x: x, y: y },
            { x: x, y: y },
            { x: x, y: y }
          ];
          this.angle = rand(0, 360);
          this.speed = rand(((self.partSpeed - self.partSpeedVariance) <= 0) ? 1 : self.partSpeed - self.partSpeedVariance, (self.partSpeed + self.partSpeedVariance));
          this.friction = 1 - self.partFriction / 100;
          this.gravity = self.partGravity / 2;
          this.hue = rand(hue - self.hueVariance, hue + self.hueVariance);
          this.brightness = rand(50, 80);
          this.alpha = rand(40, 100) / 100;
          this.decay = rand(10, 50) / 1000;
          this.wind = (rand(0, self.partWind) - (self.partWind / 2)) / 25;
          this.lineWidth = self.lineWidth;
        };

        Particle.prototype.update = function (index) {
          var radians = this.angle * Math.PI / 180;
          var vx = Math.cos(radians) * this.speed;
          var vy = Math.sin(radians) * this.speed + this.gravity;
          this.speed *= this.friction;

          this.coordLast[2].x = this.coordLast[1].x;
          this.coordLast[2].y = this.coordLast[1].y;
          this.coordLast[1].x = this.coordLast[0].x;
          this.coordLast[1].y = this.coordLast[0].y;
          this.coordLast[0].x = this.x;
          this.coordLast[0].y = this.y;

          this.x += vx * self.dt;
          this.y += vy * self.dt;

          this.angle += this.wind;
          this.alpha -= this.decay;

          if (this.alpha < .05) {
            self.particles.splice(index, 1);
          }
        };

        Particle.prototype.draw = function () {
          var coordRand = (rand(1, 3) - 1);
          self.ctx.beginPath();
          self.ctx.moveTo(Math.round(this.coordLast[coordRand].x), Math.round(this.coordLast[coordRand].y));
          self.ctx.lineTo(Math.round(this.x), Math.round(this.y));
          self.ctx.closePath();
          self.ctx.strokeStyle = 'hsla(' + this.hue + ', 100%, ' + this.brightness + '%, ' + this.alpha + ')';
          self.ctx.stroke();

          if (self.flickerDensity > 0) {
            var inverseDensity = 50 - self.flickerDensity;
            if (rand(0, inverseDensity) === inverseDensity) {
              self.ctx.beginPath();
              self.ctx.arc(Math.round(this.x), Math.round(this.y), rand(this.lineWidth, this.lineWidth + 3) / 2, 0, Math.PI * 2, false)
              self.ctx.closePath();
              var randAlpha = rand(50, 100) / 100;
              self.ctx.fillStyle = 'hsla(' + this.hue + ', 100%, ' + this.brightness + '%, ' + randAlpha + ')';
              self.ctx.fill();
            }
          }
        };

        /*=============================================================================*/
        /* Create Particles
        /*=============================================================================*/
        self.createParticles = function (x, y, hue) {
          var countdown = self.partCount;
          while (countdown--) {
            self.particles.push(new Particle(x, y, hue));
          }
        };

        /*=============================================================================*/
        /* Update Particles
        /*=============================================================================*/
        self.updateParticles = function () {
          var i = self.particles.length;
          while (i--) {
            var p = self.particles[i];
            p.update(i);
          };
        };

        /*=============================================================================*/
        /* Draw Particles
        /*=============================================================================*/
        self.drawParticles = function () {
          var i = self.particles.length;
          while (i--) {
            var p = self.particles[i];
            p.draw();
          };
        };

        /*=============================================================================*/
        /* Firework Constructor
        /*=============================================================================*/
        var Firework = function (startX, startY, targetX, targetY) {
          this.x = startX;
          this.y = startY;
          this.startX = startX;
          this.startY = startY;
          this.hitX = false;
          this.hitY = false;
          this.coordLast = [
            { x: startX, y: startY },
            { x: startX, y: startY },
            { x: startX, y: startY }
          ];
          this.targetX = targetX;
          this.targetY = targetY;
          this.speed = self.fworkSpeed;
          this.angle = Math.atan2(targetY - startY, targetX - startX);
          this.shockwaveAngle = Math.atan2(targetY - startY, targetX - startX) + (90 * (Math.PI / 180));
          this.acceleration = self.fworkAccel / 100;
          this.hue = self.currentHue;
          this.brightness = rand(50, 80);
          this.alpha = rand(50, 100) / 100;
          this.lineWidth = self.lineWidth;
          this.targetRadius = 1;
        };

        Firework.prototype.update = function (index) {
          self.ctx.lineWidth = this.lineWidth;

          vx = Math.cos(this.angle) * this.speed,
            vy = Math.sin(this.angle) * this.speed;
          this.speed *= 1 + this.acceleration;
          this.coordLast[2].x = this.coordLast[1].x;
          this.coordLast[2].y = this.coordLast[1].y;
          this.coordLast[1].x = this.coordLast[0].x;
          this.coordLast[1].y = this.coordLast[0].y;
          this.coordLast[0].x = this.x;
          this.coordLast[0].y = this.y;

          if (self.showTarget) {
            if (this.targetRadius < 8) {
              this.targetRadius += .25 * self.dt;
            } else {
              this.targetRadius = 1 * self.dt;
            }
          }

          if (this.startX >= this.targetX) {
            if (this.x + vx <= this.targetX) {
              this.x = this.targetX;
              this.hitX = true;
            } else {
              this.x += vx * self.dt;
            }
          } else {
            if (this.x + vx >= this.targetX) {
              this.x = this.targetX;
              this.hitX = true;
            } else {
              this.x += vx * self.dt;
            }
          }

          if (this.startY >= this.targetY) {
            if (this.y + vy <= this.targetY) {
              this.y = this.targetY;
              this.hitY = true;
            } else {
              this.y += vy * self.dt;
            }
          } else {
            if (this.y + vy >= this.targetY) {
              this.y = this.targetY;
              this.hitY = true;
            } else {
              this.y += vy * self.dt;
            }
          }

          if (this.hitX && this.hitY) {
            var randExplosion = rand(0, 9);
            self.createParticles(this.targetX, this.targetY, this.hue);
            self.fireworks.splice(index, 1);
          }
        };

        Firework.prototype.draw = function () {
          self.ctx.lineWidth = this.lineWidth;

          var coordRand = (rand(1, 3) - 1);
          self.ctx.beginPath();
          self.ctx.moveTo(Math.round(this.coordLast[coordRand].x), Math.round(this.coordLast[coordRand].y));
          self.ctx.lineTo(Math.round(this.x), Math.round(this.y));
          self.ctx.closePath();
          self.ctx.strokeStyle = 'hsla(' + this.hue + ', 100%, ' + this.brightness + '%, ' + this.alpha + ')';
          self.ctx.stroke();

          if (self.showTarget) {
            self.ctx.save();
            self.ctx.beginPath();
            self.ctx.arc(Math.round(this.targetX), Math.round(this.targetY), this.targetRadius, 0, Math.PI * 2, false)
            self.ctx.closePath();
            self.ctx.lineWidth = 1;
            self.ctx.stroke();
            self.ctx.restore();
          }

          if (self.showShockwave) {
            self.ctx.save();
            self.ctx.translate(Math.round(this.x), Math.round(this.y));
            self.ctx.rotate(this.shockwaveAngle);
            self.ctx.beginPath();
            self.ctx.arc(0, 0, 1 * (this.speed / 5), 0, Math.PI, true);
            self.ctx.strokeStyle = 'hsla(' + this.hue + ', 100%, ' + this.brightness + '%, ' + rand(25, 60) / 100 + ')';
            self.ctx.lineWidth = this.lineWidth;
            self.ctx.stroke();
            self.ctx.restore();
          }
        };

        /*=============================================================================*/
        /* Create Fireworks
        /*=============================================================================*/
        self.createFireworks = function (startX, startY, targetX, targetY) {
          self.fireworks.push(new Firework(startX, startY, targetX, targetY));
        };

        /*=============================================================================*/
        /* Update Fireworks
        /*=============================================================================*/
        self.updateFireworks = function () {
          var i = self.fireworks.length;
          while (i--) {
            var f = self.fireworks[i];
            f.update(i);
          };
        };

        /*=============================================================================*/
        /* Draw Fireworks
        /*=============================================================================*/
        self.drawFireworks = function () {
          var i = self.fireworks.length;
          while (i--) {
            var f = self.fireworks[i];
            f.draw();
          };
        };

        /*=============================================================================*/
        /* Events
        /*=============================================================================*/
        self.bindEvents = function () {
          $(window).on('resize', function () {
            clearTimeout(self.timeout);
            self.timeout = setTimeout(function () {
              self.ctx.lineCap = 'round';
              self.ctx.lineJoin = 'round';
            }, 100);
          });

          $(self.canvas).on('mousedown', function (e) {
            console.log(111111111);
            var randLaunch = rand(0, 5);
            self.mx = e.pageX - self.canvasContainer.offset().left;
            self.my = e.pageY - self.canvasContainer.offset().top;
            self.currentHue = rand(self.hueMin, self.hueMax);
            self.createFireworks(self.cw / 2, self.ch, self.mx, self.my);

            $(self.canvas).on('mousemove.fireworks', function (e) {
              var randLaunch = rand(0, 5);
              self.mx = e.pageX - self.canvasContainer.offset().left;
              self.my = e.pageY - self.canvasContainer.offset().top;
              self.currentHue = rand(self.hueMin, self.hueMax);
              self.createFireworks(self.cw / 2, self.ch, self.mx, self.my);
            });

          });

          $(self.canvas).on('mouseup', function (e) {
            $(self.canvas).off('mousemove.fireworks');
          });

        }

        /*=============================================================================*/
        /* Clear Canvas
        /*=============================================================================*/
        self.clear = function () {
          self.particles = [];
          self.fireworks = [];
          self.ctx.clearRect(0, 0, self.cw, self.ch);
        };

        /*=============================================================================*/
        /* Delta
        /*=============================================================================*/
        self.updateDelta = function () {
          var newTime = Date.now();
          self.dt = (newTime - self.oldTime) / 16;
          self.dt = (self.dt > 5) ? 5 : self.dt;
          self.oldTime = newTime;
        }

        /*=============================================================================*/
        /* Main Loop
        /*=============================================================================*/
        self.canvasLoop = function () {
          requestAnimFrame(self.canvasLoop, self.canvas);
          self.updateDelta();
          self.ctx.globalCompositeOperation = 'destination-out';
          self.ctx.fillStyle = 'rgba(0,0,0,' + self.clearAlpha / 100 + ')';
          self.ctx.fillRect(0, 0, self.cw, self.ch);
          self.ctx.globalCompositeOperation = 'lighter';
          self.updateFireworks();
          self.updateParticles();
          self.drawFireworks();
          self.drawParticles();
        };

        self.init();

        var initialLaunchCount = 10;
        while (initialLaunchCount--) {
          setTimeout(function () {
            self.fireworks.push(new Firework(self.cw / 2, self.ch, rand(50, self.cw - 50), rand(50, self.ch / 2) - 50));
          }, initialLaunchCount * 200);
        }

      }

      /*=============================================================================*/
      /* GUI
      /*=============================================================================*/
      var guiPresets = {
        "preset": "Default",
        "remembered": {
          "Default": {
            "0": {
              "fworkSpeed": 2,
              "fworkAccel": 4,
              "showShockwave": false,
              "showTarget": true,
              "partCount": 30,
              "partSpeed": 5,
              "partSpeedVariance": 10,
              "partWind": 50,
              "partFriction": 5,
              "partGravity": 1,
              "flickerDensity": 20,
              "hueMin": 150,
              "hueMax": 200,
              "hueVariance": 30,
              "lineWidth": 1,
              "clearAlpha": 25
            }
          },
          "Anti Gravity": {
            "0": {
              "fworkSpeed": 4,
              "fworkAccel": 10,
              "showShockwave": true,
              "showTarget": false,
              "partCount": 150,
              "partSpeed": 5,
              "partSpeedVariance": 10,
              "partWind": 10,
              "partFriction": 10,
              "partGravity": -10,
              "flickerDensity": 30,
              "hueMin": 0,
              "hueMax": 360,
              "hueVariance": 30,
              "lineWidth": 1,
              "clearAlpha": 50
            }
          },
          "Battle Field": {
            "0": {
              "fworkSpeed": 10,
              "fworkAccel": 20,
              "showShockwave": true,
              "showTarget": true,
              "partCount": 200,
              "partSpeed": 30,
              "partSpeedVariance": 5,
              "partWind": 0,
              "partFriction": 5,
              "partGravity": 0,
              "flickerDensity": 0,
              "hueMin": 20,
              "hueMax": 30,
              "hueVariance": 10,
              "lineWidth": 1,
              "clearAlpha": 40
            }
          },
          "Mega Blast": {
            "0": {
              "fworkSpeed": 3,
              "fworkAccel": 3,
              "showShockwave": true,
              "showTarget": true,
              "partCount": 500,
              "partSpeed": 50,
              "partSpeedVariance": 5,
              "partWind": 0,
              "partFriction": 0,
              "partGravity": 0,
              "flickerDensity": 0,
              "hueMin": 0,
              "hueMax": 360,
              "hueVariance": 30,
              "lineWidth": 20,
              "clearAlpha": 20
            }
          },
          "Nimble": {
            "0": {
              "fworkSpeed": 10,
              "fworkAccel": 50,
              "showShockwave": false,
              "showTarget": false,
              "partCount": 120,
              "partSpeed": 10,
              "partSpeedVariance": 10,
              "partWind": 100,
              "partFriction": 50,
              "partGravity": 0,
              "flickerDensity": 20,
              "hueMin": 0,
              "hueMax": 360,
              "hueVariance": 30,
              "lineWidth": 1,
              "clearAlpha": 80
            }
          },
          "Slow Launch": {
            "0": {
              "fworkSpeed": 2,
              "fworkAccel": 2,
              "showShockwave": false,
              "showTarget": false,
              "partCount": 200,
              "partSpeed": 10,
              "partSpeedVariance": 0,
              "partWind": 100,
              "partFriction": 0,
              "partGravity": 2,
              "flickerDensity": 50,
              "hueMin": 0,
              "hueMax": 360,
              "hueVariance": 20,
              "lineWidth": 4,
              "clearAlpha": 10
            }
          },
          "Perma Trail": {
            "0": {
              "fworkSpeed": 4,
              "fworkAccel": 10,
              "showShockwave": false,
              "showTarget": false,
              "partCount": 150,
              "partSpeed": 10,
              "partSpeedVariance": 10,
              "partWind": 100,
              "partFriction": 3,
              "partGravity": 0,
              "flickerDensity": 0,
              "hueMin": 0,
              "hueMax": 360,
              "hueVariance": 20,
              "lineWidth": 1,
              "clearAlpha": 0
            }
          }
        },
        "closed": true,
        "folders": {
          "Fireworks": {
            "preset": "Default",
            "closed": false,
            "folders": {}
          },
          "Particles": {
            "preset": "Default",
            "closed": true,
            "folders": {}
          },
          "Color": {
            "preset": "Default",
            "closed": true,
            "folders": {}
          },
          "Other": {
            "preset": "Default",
            "closed": true,
            "folders": {}
          }
        }
      };


      var fworks = new Fireworks();
      var gui = new dat.GUI({
        autoPlace: false,
        load: guiPresets,
        preset: 'Default'
      });
      var customContainer = document.getElementById('gui');
      customContainer.appendChild(gui.domElement);

      var guiFireworks = gui.addFolder('Fireworks');
      guiFireworks.add(fworks, 'fworkSpeed').min(1).max(10).step(1);
      guiFireworks.add(fworks, 'fworkAccel').min(0).max(50).step(1);
      guiFireworks.add(fworks, 'showShockwave');
      guiFireworks.add(fworks, 'showTarget');

      var guiParticles = gui.addFolder('Particles');
      guiParticles.add(fworks, 'partCount').min(0).max(500).step(1);
      guiParticles.add(fworks, 'partSpeed').min(1).max(100).step(1);
      guiParticles.add(fworks, 'partSpeedVariance').min(0).max(50).step(1);
      guiParticles.add(fworks, 'partWind').min(0).max(100).step(1);
      guiParticles.add(fworks, 'partFriction').min(0).max(50).step(1);
      guiParticles.add(fworks, 'partGravity').min(-20).max(20).step(1);
      guiParticles.add(fworks, 'flickerDensity').min(0).max(50).step(1);

      var guiColor = gui.addFolder('Color');
      guiColor.add(fworks, 'hueMin').min(0).max(360).step(1);
      guiColor.add(fworks, 'hueMax').min(0).max(360).step(1);
      guiColor.add(fworks, 'hueVariance').min(0).max(180).step(1);

      var guiOther = gui.addFolder('Other');
      guiOther.add(fworks, 'lineWidth').min(1).max(20).step(1);
      guiOther.add(fworks, 'clearAlpha').min(0).max(100).step(1);
      guiOther.add(fworks, 'clear').name('Clear');

      gui.remember(fworks);
    })
  </script>



</body>

</html>